From 020318d0d2af51e0fd59ba654ede9b2171558720 Mon Sep 17 00:00:00 2001 From: Dave Jones Date: Tue, 12 Apr 2011 15:29:54 -0700 Subject: [PATCH] irda: fix locking unbalance in irda_sendmsg 5b40964eadea40509d353318d2c82e8b7bf5e8a5 ("irda: Remove BKL instances from af_irda.c") introduced a path where we have a locking unbalance. If we pass invalid flags, we unlock a socket we never locked, resulting in this... ===================================== [ BUG: bad unlock balance detected! ] ------------------------------------- trinity/20101 is trying to release lock (sk_lock-AF_IRDA) at: [] irda_sendmsg+0x207/0x21d [irda] but there are no more locks to release! other info that might help us debug this: no locks held by trinity/20101. stack backtrace: Pid: 20101, comm: trinity Not tainted 2.6.39-rc3+ #3 Call Trace: [] ? irda_sendmsg+0x207/0x21d [irda] [] print_unlock_inbalance_bug+0xc7/0xd2 [] ? irda_sendmsg+0x207/0x21d [irda] [] lock_release+0xcf/0x18e [] release_sock+0x2d/0x155 [] irda_sendmsg+0x207/0x21d [irda] [] __sock_sendmsg+0x69/0x75 [] sock_sendmsg+0xa1/0xb6 [] ? might_fault+0x5c/0xac [] ? lock_release+0x181/0x18e [] ? might_fault+0xa5/0xac [] ? might_fault+0x5c/0xac [] ? fcheck_files+0xb9/0xf0 [] ? copy_from_user+0x2f/0x31 [] ? verify_iovec+0x52/0xa6 [] sys_sendmsg+0x23a/0x2b8 [] ? lock_release+0x181/0x18e [] ? up_read+0x28/0x2c [] ? do_page_fault+0x360/0x3b4 [] ? trace_hardirqs_on_caller+0x10b/0x12f [] ? finish_task_switch+0xb2/0xe3 [] ? finish_task_switch+0x46/0xe3 [] ? trace_hardirqs_off_caller+0x33/0x90 [] ? retint_swapgs+0x13/0x1b [] ? trace_hardirqs_on_caller+0x10b/0x12f [] ? audit_syscall_entry+0x11c/0x148 [] ? trace_hardirqs_on_thunk+0x3a/0x3f [] system_call_fastpath+0x16/0x1b Signed-off-by: Dave Jones Signed-off-by: David S. Miller --- net/irda/af_irda.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/net/irda/af_irda.c b/net/irda/af_irda.c index c9890e25cd4c..cc616974a447 100644 --- a/net/irda/af_irda.c +++ b/net/irda/af_irda.c @@ -1297,8 +1297,7 @@ static int irda_sendmsg(struct kiocb *iocb, struct socket *sock, /* Note : socket.c set MSG_EOR on SEQPACKET sockets */ if (msg->msg_flags & ~(MSG_DONTWAIT | MSG_EOR | MSG_CMSG_COMPAT | MSG_NOSIGNAL)) { - err = -EINVAL; - goto out; + return -EINVAL; } lock_sock(sk); -- GitLab